There could be, but it would be a very controversial and not in - line - with - the - canon kind of fanfic. Naruto and Kushina have a specific relationship in the original series (mother - son), so creating a fanfic with such a plot would be quite a deviation. Most official platforms might not even allow such content due to its inappropriate nature.
This kind of fanfic would have serious ethical issues. Since Kushina is Naruto's mother in the original story, it goes against basic moral and family values. It's a form of inappropriate and disturbing content that violates the natural order of the story's relationships.
I'm not aware of any such fanfiction that would be appropriate for all ages considering the nature of the concept which seems inappropriate. Fanfiction should generally follow ethical and moral guidelines, and this topic goes against normal family and story relationships in the Naruto universe.
Another idea could be a fanfiction focused on Naruto's training with a long - lost master who has a very different style of teaching compared to Jiraiya. This could show Naruto developing new skills and growing as a ninja in a different way. There could also be a fanfiction about Naruto's time as Hokage, dealing with diplomatic issues between different ninja villages, which would be more in line with the positive and respectful nature of the Naruto universe.
There may or may not be a 'naruto impregnates shizune fanfic'. The world of fanfiction is vast, and while there are fanfics on all sorts of relationships and scenarios in the Naruto universe, this particular one seems rather out - of - the - ordinary. You would need to search through various fanfic platforms, but it's not guaranteed to be there.
I'm not sure if there is such a specific fanfic. Fanfic topics can be very diverse, but this particular one might be quite rare or even against the general ethics and guidelines of some fanfic communities.
Definitely not. The Naruto series is about many positive values like loyalty, hard work and friendship. A fanfic with this kind of inappropriate plot goes against what the series stands for. It also disrespects the characters and the relationships that the creator has established. Fans usually prefer fanfics that are in line with the original spirit of the show, such as those that explore unshown battles or different character development paths within the acceptable boundaries.
There are indeed some. You can look for ones that are centered around their emotional connection. For instance, stories where Kushina's spirit guides Naruto in some way, or where they interact in Naruto's mindscape. These types of fanfictions stay away from improper content and instead explore the deeper, more positive elements of their relationship.
One possible fanfic could be about Kushina's early days in the Hidden Leaf. It might explore her training as a ninja, her relationships with her peers, and how she was perceived in the village. Maybe it delves into her friendship with Mikoto and how they supported each other during their pregnancies.
Perhaps in the 'naruto bangs kushina fanfic', there is a plot where Naruto discovers a hidden power within Kushina that was never explored in the main series. This power could be crucial in saving the village from a new and powerful threat. He then has to work with Kushina to harness this power and protect their home.